Message Passing Interface: Difference between revisions

Revision as of 11:17, 26 September 2022

Revision as of 16:28, 16 February 2023

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===Point-to-point basics===

A number of important MPI functions involve communication between two specific processes. A popular example is <code>MPI_Send</code>, which allows one specified process to send a message to a second specified process. Point-to-point operations, as these are called, are particularly useful in patterned or irregular communication, for example, a [[data parallelism|data-parallel]] architecture in which each processor routinely swaps regions of data with specific other processors between calculation steps, or a [[master-/slave (technology)|master-slavemaster–slave]] architecture in which the master sends new task data to a slave whenever the prior task is completed.

MPI-1 specifies mechanisms for both [[blocking (computing)|blocking]] and non-blocking point-to-point communication mechanisms, as well as the so-called 'ready-send' mechanism whereby a send request can be made only when the matching receive request has already been made.